1.) You run an independent samples t-test and obtain the following summary data:

Sample 1: n₁ = 10 and M₁ = 50

Sample 2: n₂ = 12 and M₂ = 58

SE_M1-M2 = 4

What is your obtained value of t?

2.) You want to know if extra practice computing t-tests influences students' performance. You gather 3 students, measure their statistics skills with a t-test quiz, and then have them practice computing t-tests for an hour each day for 2 weeks. Then you quiz them again. Your data are as follows; use alpha = .05 to test your hypothesis.

Student	Pre-practice Quiz	Post-practice Quiz
A	4	10
B	2	7
C	1	4

Using the data above, answer the following questions.

a. Write the null hypothesis.

b. Write the research hypothesis.

c. What is t_crit?

d. Calculate t_obt

e. Can you reject the null hypothesis?

f. Calculate Cohen's d.